Investment Securities - Amortized cost and approximate fair values of securities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 122,730	$ 110,822
Gross Unrealized Gains	1,148	3,535
Gross Unrealized Losses	(3,991)	(587)
Fair Value	119,887	113,770
Federal agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	38,075	42,581
Gross Unrealized Gains	224	849
Gross Unrealized Losses	(1,086)	(21)
Fair Value	37,213	43,409
State and municipal
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	37,709	29,331
Gross Unrealized Gains	748	1,865
Gross Unrealized Losses	(1,335)	(34)
Fair Value	37,122	31,162
Government-sponsored enterprise (GSE) residential mortgage-backed and other asset-backed agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	42,782	35,258
Gross Unrealized Gains	176	774
Gross Unrealized Losses	(1,157)	(10)
Fair Value	41,801	36,022
Corporate
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,164	3,652
Gross Unrealized Gains		47
Gross Unrealized Losses	(413)	(522)
Fair Value	$ 3,751	$ 3,177